My stomach "growls" not from hunger, it growls all the time, and it's loud and embarrasing. How do I stop this?

Get checked. Borborygmi (loud growling) can be from hunger, spasms, parasites (like giardia), partial obstruction, bacterial overgrowth, other. Get checked.
Simethacone. You might try a product with simethacone in it. It is in some antacids, like maalox plus. Read labels.